JP4462673B2 - Throw-away side cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away side cutter in which a throw-away tip is incorporated on the outer periphery of a disk-shaped tool body, and is particularly suitable for cutting stainless steel, mild steel, or the like.
[0002]
[Prior art]
As such a throw-away side cutter, for example, what is disclosed in Japanese Utility Model Laid-Open No. 5-12027 is shown in FIGS.
[0003]
The chip 22 is mounted on a chip mounting seat 21 formed on the outer peripheral side surface of the tool body 20 made of a disk-shaped steel material or the like. The chip 22 is a square flat plate made of cemented carbide or the like, and has a cutting edge formed at the intersecting ridge line portion between its upper and lower surfaces and its outer surface. A mounting hole 24 for fixing the chip 22 to the chip mounting seat 22 is formed in the center of the upper and lower surfaces of the chip 22.
[0004]
The chip mounting seat 21 on which the chip 22 is seated is formed in a concave groove shape so that the upper and lower surfaces of the chip 22 can be mounted in the radial direction of the tool body 20. A screw hole is screwed on the bottom wall surface so as to coincide with the mounting hole 23 of the chip 22. Such chip mounting seats 21 are arranged in a staggered manner at equal intervals in the circumferential direction of the outer peripheral surface of the tool body 20.
[0005]
The chip 22 is placed on the chip mounting seat 21, a tightening screw is inserted into the mounting hole, and the tightening screw is screwed into the screw hole of the chip mounting seat 21. Is directly fixed in a state of being oriented in the radial direction of the tool body 20.
[0006]
[Problems to be solved by the invention]
Here, the problems of the prior art are described below.
[0007]
The above-described prior art is an improvement of the chip arrangement and the clamping method. That is, in order to improve the rigidity of the tool body, the tip is arranged so that the thickness direction of the tip coincides with the radial direction of the tool body, and a fixing method using a fastening screw is employed.
[0008]
However, the throw-away side cutter having this configuration has a shallow chip pocket groove to increase the rigidity of the tool body. Further, the interval between adjacent chips is narrow, and the groove width of the chip pocket provided on the front side in the rotation direction of the chips is inevitably narrow.
[0009]
For this reason, especially when processing materials that discharge flow-type chips, such as mild steel and stainless steel, or when processing with high cutting efficiency and high cutting efficiency, As a result, the chip was accumulated in the chip pocket, leading to an increase in cutting resistance, or deformation of the tool body and vibration.
[0010]
Further, although the prior art is arranged such that the axial rake angle of the tip is inclined rearward in the rotational direction as it goes from the both end faces to the center of the tool body, the angle is small and burrs are generated. Could not be prevented completely.
[0011]
The present invention has been made based on such a technical background, and an object of the present invention is to provide a throw-away type side cutter capable of improving chip discharge and preventing occurrence of burrs. is there.
[0012]
[Means for Solving the Problems]
The present invention has been made in view of the problems as described above, and a rectangular flat plate-shaped throw-away tip is used as a rake face on a tip mounting seat recessed on the outer peripheral side surface of a disk-shaped tool body. in indexable side cutters were to be detachably mounted, said been granted relief angle in the throw-away tip, the outer surface is formed on the exterior isosceles trapezoid shape, a pair of outer surfaces opposite the A corner R is formed on an isosceles trapezoidal sharp corner on the outer surface which is a rake face, and the corner R protrudes outward in the width direction of the tool body to form an isosceles trapezoid. The upper base is a seating surface, the lower base is a side surface , and the lower base of an isosceles trapezoidal shape that is continuous with the corner R intersects with the long base cutting edge extending in the radial direction of the tool body. Front edge is front The cutting insert such that the short side cutting edge extending in the width direction of the tool body, characterized in that it is mounted in a staggered edge format.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 to 6 show a first embodiment of the present invention. 1 and 2 show a state in which a throw-away tip (hereinafter referred to as “chip”) 7 is mounted on a disk-shaped tool body 1. The tool body 1 is made of steel or the like, and an attachment hole 2 for attachment to the spindle end of the machine tool is provided at the center thereof. On the outer periphery of the tool body 1, chip mounting seats 3 are formed at equal intervals in the circumferential direction, and a V-grooved chip pocket 6 is formed in front of the tool rotation direction N in an end view. .
[0015]
The chip mounting seat 3 is formed in a groove shape so that the lower surface 9 of the chip 7 can be mounted in the axial direction of the tool body 1, and a screw hole 4 is screwed in the center thereof. Has been. The tip 7 is directly screwed to the tool body 1 with a fastening screw 5 through a mounting hole 12 penetrating in the center thereof. Thus, the chip | tip 7 was arranged vertically in order to process a narrow groove | channel and to improve an intensity | strength with respect to the main component force direction of cutting resistance.
[0016]
FIG. 3 is a view of the throw-away side cutter as viewed from the outer peripheral surface. The chips 7 are alternately mounted in a so-called staggered pattern on both end surfaces of the tool body 1 with the acute corners 13 protruding outward in the width direction of the tool body 1. The reason why the staggered blade is used is that the cutting edge of the tip 7 is alternately involved in the inner wall of the groove, thereby avoiding deformation of the tool body 1 and performing well-balanced machining.
[0017]
The short side cutting edge 15 formed on the side ridge portion of the outer surface 10 of the tip 7 is disposed at a predetermined angle (hereinafter referred to as “axial rake”) α with respect to the axial direction of the tool body 1. ing. The direction of inclination is a direction that moves backward in the rotational direction N as it goes from the end face side of the tool body 1 to the center of the width (hereinafter, this direction is referred to as “positive”). This angle is set to 3 ° to 25 °. If the angle is less than 3 °, the effects of the present invention described later cannot be obtained. If the angle is greater than 25 °, the cutting edge strength decreases and the life becomes short.
[0018]
The reason why the axial rake α is set to positive is to improve the biting property first and prevent the occurrence of burrs due to the sharp sharpness. Second, to reduce cutting resistance and avoid vibration. The third reason is to control the chip discharge direction to obtain excellent accuracy of the inner wall surface of the groove. When the axial rake α is negative, that is, when contacting from the center of the width of the tool body 1 and detaching from the end side, the chip flows from the center to the end side, so that the chip discharge property is good. There is a problem that chips collide with and contact the inner wall surface of the processing groove, and damage the wall surface. On the other hand, when the axial rake α is positively formed as in the configuration of the present invention, it contacts from the end side of the tool body 1 and is detached from the center of the width, so that the chips flow in the same way. It is possible to prevent the wall surface from being damaged. However, on the contrary, the chip discharge property is lowered, and another problem arises in that chip clogging occurs. Therefore, according to the present invention, the angle of the axial rake α is set to be sufficiently large, the chip pocket 6 is deepened, and a V-groove is formed on the outer side in the radial direction of the tool body 1 to form a chip. This prevents the deterioration of wall surface accuracy. Since stainless steel, mild steel, and the like are materials that are likely to generate burrs and are easy to stretch, the present invention is particularly suitable for grooving such materials, and a remarkable effect is recognized. When processing a material that discharges shear-type chips or crack-type chips, it is not preferable to set the axial rake α to be positive because it may cause a negative effect. For example, stress may concentrate on the cutting edge, leading to a reduction in cutting edge strength.
[0019]
The radial rake β is set to −5 ° to −30 °. The reason why the radial rake β is set to be negative is to increase the cutting edge strength and to reduce the contact area between the rake face and the chip. This is because stainless steel, mild steel, and the like discharge flow-type chips, so that the contact area between the chips and the chips tends to increase, and the cutting resistance may increase. Therefore, it is inappropriate to provide a chip breaker or the like on the rake face of the chip to make the radial rake β positive. The reason why the upper limit value and the lower limit value are set in this manner is that consideration is given to obtaining the effect of the present invention and not reducing chip disposal.
[0020]
Here, the tool specifications of the throw-away side cutter according to the present invention are organized. The outer diameter of the blade edge φD = 100 to 200 mm, the blade width W = 4 to 13 mm, the number of blades Z = 8 to 20 sheets, the axial rake α = 3 °. -25 °, radial rake β = -5 ° to -30 °, outer clearance angle γ = 1 ° to 6 °. Here, as shown in FIG. 4, the outer peripheral clearance angle γ refers to an angle between the long side cutting edge 14 and the groove inner wall surface. As described above, the tip 7 is arranged in a staggered pattern. When the blade width W is small, the right blade and the left blade are each composed of two rows as in this embodiment, but when the blade width W is large, the right blade and the left blade are each two rows. A total of four rows can be configured. In order to increase the accuracy of the machining groove, a chamfer surface corresponding to a so-called flicker land may be formed on the short edge 15 on the outer peripheral side.
[0021]
5 and 6 clearly show the throw-away tip 7 attached to the throw-away side cutter. The chip 7 is a so-called positive chip having cemented carbide as its constituent material, upper and lower surfaces 8 and 9 formed in a square shape, and a clearance angle provided in advance. The outer side surfaces 10 and 11 are formed in a trapezoidal shape, and are mounted so that the upper bottom is a seating surface and the lower bottom is a side surface. Of the outer side surfaces 10 and 11, a pair of outer side surfaces 10 forms a rake surface, and the other pair of outer side surfaces 11 forms a flank surface. The edge of the outer surface 10 that is the rake face is provided with a cutting edge, the short edge 15 is disposed in the groove width direction X, and the long edge 14 is disposed in the groove depth direction Y. A corner R is formed at an acute corner 13 where the short edge 15 and the long edge 14 intersect.
[0022]
Next, FIG. 7 shows a second embodiment of the present invention. The floor plate 18 that is in contact with the chip 17 and is located behind the rotation direction N of the tool body 16 is fixed by a tightening screw 19 with its thickness direction directed in the axial direction of the tool body 16. The floor plate 18 is effective in that the tool body 16 is prevented from being deformed / damaged and the chip 17 is prevented from being lost. Description of other components that are the same as those of the first embodiment will be omitted.
[0023]
【The invention's effect】
According to the present invention, the biting property is improved and the generation of burrs can be prevented by the sharpness. Further, the cutting resistance is reduced, and the machining can be performed smoothly without causing chatter and vibration. Furthermore, it is possible to obtain excellent accuracy of the groove inner wall surface without the discharged chips coming into contact with the groove inner wall surface.
[Brief description of the drawings]
FIG. 1 is a perspective view of a throw-away type side cutter showing a first embodiment of the present invention.
FIG. 2 is a front view of the throw-away type side cutter shown in FIG.
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a view for explaining a state of grooving.
5 shows a throw-away tip mounted on the throw-away side cutter shown in FIG. 1, (a) is a plan view, (b) is a front view, and (c) is a side view.
6 is a perspective view of the throw-away tip shown in FIG. 5. FIG.
7A and 7B show a second embodiment of the present invention, wherein FIG. 7A is a front view and FIG. 7B is a plan view.
FIG. 8 is a front view showing an example of a conventional throw-away side cutter.
FIG. 9 is a plan view of the throw-away type side cutter of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tool main body 3 Tip mounting seat 6 Chip pocket 7 Tip 8 Tip upper surface 10, 11 Tip side surface 14 Long edge cutting edge 15 Short edge cutting edge 18 Base plate

Claims (2)

The chip mounting seat that is recessed on the outer peripheral side surface of the tool body forming a disk-shaped, rectangular plate-shaped throw-away tip, indexable side cutters were to be detachably mounted as a rake face and the outer surface The throwaway tip is provided with a clearance angle, the outer surface is formed in an isosceles trapezoidal shape, and the pair of opposed outer surfaces is an outer surface serving as a rake surface, and the outer surface serving as a rake surface. A corner R is formed on the acute corner of the isosceles trapezoidal shape, the corner R protrudes outward in the width direction of the tool body, the upper base of the isosceles trapezoid is the seating surface, the lower base is the side surface , and the corner R A long side cutting edge in which the lower base of the isosceles trapezoidal shape extending in the radial direction of the tool main body, and a short edge cutting in which the side ridge portion intersecting the lower base via the corner R extends in the width direction of the tool main body so that the blade Indexable side cutter cutting insert is characterized in that it is mounted in a staggered edge format.  The throw-away side cutter is characterized in that the cutting edge of the throw-away tip is set to an axial rake α = 3 ° to 25 ° and a radial rake β = −5 ° to −30 °.

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